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Oakland Athletics’ Matt Olson, right, celebrates with Stephen Piscotty (25) and Marcus Semien, center, after hitting a three-run home run off Seattle Mariners’ Wade LeBlanc during the fourth inning of a baseball game Friday, May 24, 2019, in Oakland, Calif. (AP Photo/Ben Margot)

OAKLAND — Khris Davis may be down for the count, but the power is still pumping at Oakland Coliseum.

The latest rays of light came from Matt Olson, Mark Canha (back-to-back) and Stephen Piscotty, all of whom went yard Friday in a 6-2 victory over the Seattle Mariners. The A’s have won seven straight and, not coincidentally, hit 19 home runs over that streak.

A change in location — against a bottom-feeding team like Detroit, no less — could be credited for the offensive spark. But, according to Mark Canha, sometimes a flint is lit once the team starts to see one guy rolling.

“It always helps when you have that one guy where everyone’s like, ‘Yeah, he’s up!’” Canha said. “I think that happens to be right now.”

Canha is getting his moment in the sun despite a dark cloud: he’ll be the designated hitter in the coming days while Davis recovers from an injured oblique that finally forced the A’s to put on the 10-day IL. Canha hit a solo shot in the fourth inning on a 1-0 fastball, extending his home run streak to three games. He has hit six homers in this seven-game win streak.

As any hitter may assert, Canha said that playing consistently has helped his performance soar. Any adjustments he makes have time to marinate and then be applied successfully.

Filling the DH role in Davis’s absence, rather than playing the field, also has helped.

“Well, I’ve DH’d three times the past three days and I really like it,” Canha said. “I really like not having to run out on the field.”

Canha’s power is thriving with the seed of opportunity. Olson’s power has arrived ahead of schedule.

Olson had expected the surgery he had March 22 after breaking the hamate bone in his right wrist would sap his power. Yet, just a few weeks after his reinstatement from the IL, he has found his home run stroke. His three-run homer off Wade LeBlanc’s first-pitch curveball was Olson’s fifth over 11 games. He’s batting .321 over his last eight games.

A naturally looser bat grip made it easier for Olson to adjust. His swing doesn’t need a tight grip to exert power, he said.

“I always heard that hamate injuries affect power,” Olson said. “But once I started coming back it felt normal, and I’m a guy who likes to have loose hands on the bat anyway. So not having full grip strength wasn’t really a huge issue for me.”

Olson’s home run to right-center gave the A’s a 3-1 lead. Canha’s jack to left made it 4-1.

“At night, that’s a tough spot to hit at our place,” A’s manager Bob Melvin said of Olson’s home run.

The back-to-back homers erased the 1-0 lead the Mariners had scratched out against A’s starter Daniel Mengden, who walked five batters in four innings. Mengden had four strikeouts, but the base paths were bustling.

“Obviously, we want our starters to go more than four innings,” Melvin said. “But it felt like there was a ton of traffic out there. You have to give him credit for making pitches when he had to.”